locks and kernel randomness...

[Warner Losh]

> On Feb 25, 2015, at 1:56 AM, Konstantin Belousov <kostikbel at gmail.com> wrote:
> So neither buildworld timing, nor network throughput are adequate
> to estimate the change.  It is system unresponsivness and loss of
> the realtime behaviour up to some degree.

Yes. You need to look at the changes affects, if any, on outlier behavior under load.
Without careful monitoring of that, you won’t see the bad effects. I’ve made several
changes over the years to improve performance that I later (usually much later) had
to back out or modify because it made the outlier behavior much worse.

So data here isn’t “I did 3 build worlds and the time was about the same” even if ministat(8)
says there’s no difference.

Warner